Upon hearing Wu Peng's words, Imperial Mountain Quasi-Emperor thought to himself that it seemed the conduct of the Skyfire Clan had infuriated the Saints outside their clan, leading no non-Skyfire Clan Saints to be willing to serve as Tributors for the Skyfire Imperial Family anymore. This weakened the power of the Skyfire Clan, making them feel the crisis and thus chose to pledge their loyalty to him proactively.
Only at the brink of life and death did they choose to pledge loyalty, which irritated the Imperial Mountain Quasi-Emperor somewhat. However, he didn't care too much about it; to him, the Skyfire Clan wasn't particularly important. What he wanted most was Mu Qinglan.
With the Skyfire Clan as hostages, Mu Qinglan would have to marry him whether she liked it or not. He didn't believe that Mu Qinglan, the venerated ancestor of the Skyfire Imperial Family, would eventually abandon the entire Skyfire Clan and flee alone.
